[Piglit] Log crashed subtest V2

[Dylan Baker]

for the series:
Reviewed-by: Dylan Baker <dylan at pnwbakers.com>

Quoting Fabian Bieler (2018-01-28 16:22:10)
> The idea is to convert tests with subtests to either use piglit_run_selected_subtests or call piglit_register_subtests at the start of the test. Either approach enumerates all all subtests to stdout in JSON format before running them.
> 
> The python framework can use this to deduce which subtest crashed.
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